fix: Remove extra box around the GET URL on event export page

[ShreyanshSrivastava]

Fixes #4407

Short description of what this resolves:

My proposed code changes are fixing the extra box coming around the URL tab under GET request on the event export page.

Changes proposed in this pull request:

-Added classes .text .aligned .center styled in open-event-frontend.css to the div containing the url.
-Added classes .ui .basic .segments styled in open-event-frontend.css to the CopyButton containing
the URL.

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[codecov]

Codecov Report

Merging #4467 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #4467   +/-   ##
============================================
  Coverage        22.28%   22.28%           
============================================
  Files              469      469           
  Lines             4950     4950           
  Branches             6        6           
============================================
  Hits              1103     1103           
  Misses            3846     3846           
  Partials             1        1           

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